EP 1016201 A1 20000705 - ADJUSTABLE VOLTAGE CONVERTER UTILIZING A CHARGE PUMP
Title (en)
ADJUSTABLE VOLTAGE CONVERTER UTILIZING A CHARGE PUMP
Title (de)
REGELBARER SPANNUNGSWANDLER MIT LADUNGSPUMPE
Title (fr)
CONVERTISSEUR DE TENSION REGLABLE UTILISANT UNE POMPE A CHARGE
Publication
Application
Priority
- US 9809728 W 19980513
- US 86505297 A 19970529
Abstract (en)
[origin: US5841648A] An adjustable charge pump design employs a variable voltage level means to reduce the charge on the charge pump charging capacitor. The charge pump output is thereby controlled without the use of any secondary pass elements applied to the charge pump output voltage. The variable voltage level means, e.g. a variable resistor, "steals" voltage from the charging capacitor in either an inverting charge pump configuration or a doubling configuration. The voltage converter employing the adjustable charge pump is advantageously applied to providing an adjustable contrast control for an LCD display. Certain intrinsic safety requirements are achievable with the present design thereby making possible a backlit, intrinsically safe LCD display.
IPC 1-7
IPC 8 full level
G05F 1/59 (2006.01); H02M 3/07 (2006.01); H05B 33/08 (2006.01)
CPC (source: EP US)
H02M 3/07 (2013.01 - EP US); H05B 45/14 (2020.01 - EP US); H05B 45/37 (2020.01 - EP US); H05B 45/395 (2020.01 - EP US)
Citation (search report)
See references of WO 9854825A1
Designated contracting state (EPC)
DE
DOCDB simple family (publication)
US 5841648 A 19981124; AR 012869 A1 20001122; AU 7384198 A 19981230; CN 1134884 C 20040114; CN 1258392 A 20000628; DE 69802207 D1 20011129; DE 69802207 T2 20020418; EP 1016201 A1 20000705; EP 1016201 B1 20011024; HK 1027684 A1 20010119; JP 2002500858 A 20020108; JP 3429009 B2 20030722; MY 120744 A 20051130; WO 9854825 A1 19981203
DOCDB simple family (application)
US 86505297 A 19970529; AR P980102460 A 19980527; AU 7384198 A 19980513; CN 98805562 A 19980513; DE 69802207 T 19980513; EP 98921168 A 19980513; HK 00106676 A 20001020; JP 50071399 A 19980513; MY PI9802384 A 19980528; US 9809728 W 19980513